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Effect of Nitrogen Application Rates on Nitrous Oxide Emission during Crop Cultivations in Upland Soil
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Effect of Nitrogen Application Rates on Nitrous Oxide Emission during Crop Cultivations in Upland Soil
Lee, Jong-Eun; Yun, Yeo-Uk; Choi, Moon-Tae; Jung, Suck-Kee; Nam, Yun-Gyu; Pramanik, Prabhat; Kim, Pil-Joo;
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BACKGROUND: Generally, nitrogen (N) fertilization higher than the recommended dose is applied during vegetable cultivation to increase productivity. But higher N fertilization also increases the concentrations of nitrate ions and nitrous oxide in soil. In this experiment, the impact of N fertilization was studied on nitrous oxide () emission to standardize the optimum fertilization level for minimizing emission as well as increasing crop productivity. Herein, we developed emission inventory for upland soil region during red pepper and Chinese milk vetch cultivation. METHODS AND RESULTS: Nitrogen fertilizers were applied at different rates to study their effect on emission during red pepper and Chinese milk vetch cultivation. The gas samples were collected by static closed chamber method and concentration was measured by gas chromatography. The total flux was steadily increased due to increasing N fertilization level, though the overall pattern of emission dynamics was same. Application of N fertilization higher than the recommended dose increased the values of both seasonal flux (94.5% for Chinese cabbage and 30.7% for red pepper) and emission per unit crop yield (77.9% for Chinese cabbage and 23.2% for red pepper). Nitrous oxide inventory revealed that the emission due to unit amount of N application from short-duration vegetable field in fall (autumn) season (6.36 kg/ha) was almost 70% higher than that during summer season. CONCLUSION: Application of excess N-fertilizers increased seasonal flux especially the flux per unit yield during both Chinese cabbage and red pepper cultivation. This suggested that the higher N fertilization than the recommended dose actually facilitates emission than boosting plant productivity. The inventory for upland farming in temperate region like Korea revealed that flux due to unit amount of N-fertilizer application for Chinese cabbage in fall (autumn) season was comparatively higher than that of summer vegetables like red pepper. Therefore, the judicious N fertilization following recommended dose is required to suppress emission with high vegetable productivity in upland soils.
emission inventory; flux;N fertilizer treatment;Vegetable cultivation;
 Cited by
Assessment on Nitrous Oxide (N2O) Emissions different Nitrogen Application Rates during the Red Pepper Cultivation in Flat Upland,;;;;;;

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